Method for encoding, including compressed images, including "range code" or arithmetic compression.

A method for encoding a sequence of symbols using several models of arithmetic encoding type or the range and comprising steps wherein: - each model is associated with a membership criterion, - one traverses on to determine, for each symbol, the model encoding it belongs to, according to criteria; then - a probability of occurrence is determined for each symbol in the corresponding template; then, - is traversed following by encoding each symbol sequence; and, - it is a file from the resulting code.